I have signals belonging to diseased and healthy samples recorded from multiple electrodes. These signals are taken monthly and are of arbitrary length (say 4-5 mins). I am planning to do a power spectrum analysis (comparison between healthy and diseased). Now to do this two methods come to mind.
- Take the normalized power spectrum of the 4/5 min signal as it is and average it over the electrodes.
- Divide the 4-5 min recordings to smaller (say 5 seconds) segments, obtain the normalized power spectrum of each segment, average it over all the segments, and finally average it over the electrodes.
which of the following methods would give a better analysis?